DE2850361A1 - PAPER MACHINE - Google Patents

Description

Paper machine

The invention is characterized in part by a length of the first web section such that the pulp or Fabric web running into the second web section Has time to reach such a degree of matting that the fibers can no longer move one another significantly.

The invention relates to a double-wire arrangement in a paper machine with a single-wire first part with its own dehydrating agent, with the help of which water is withdrawn from the forming fabric before it closes a subsequent part moves on, mo the single longitudinal sieve facing another fourdrinier, the two fourdrinier initially bend when they via a dewatering roller which forms a further dewatering agent be guided.

DiB invention has the advantage that it has the basic features a single length sieve ^ -Na ßpartie of a Fourdrinier wire mesh combined with a twin long wire wet section. This means that the forming in the single screen section with a desired degree of drainage taking place, ujobei

806845/0618

matting appropriate to the raw material according to the inevitable Factors of the fiber material, the fiber length, the degree of fiber milling and the like. Going on.

The main purpose of the invention is to eliminate the usual disadvantages of twin-wire form inlet rollers by replacing the same with a Fourdrinier system with a single long wire first section and a double long wire second section, and wherein in the first part "the dewatering is carried out with such care that the pulp web is in front the twin-length sieve batch has the opportunity to produce a specific To achieve the degree of matting, and in the second part the following drainage via a drainage roller takes place so that water in the curved part is withdrawn by the action of centrifugal force and the pressures that caused by the comparison of the two Fourdrinier wires.

The headbox outlet is oriented so that that the partially drained aqueous suspension is generally passed to the outside, the suspension is placed on the first fourdrinier wire before it comes into contact with the second fourdrinier wire.

The invention is described in detail in the following paragraphs, with reference to those in the accompanying drawing

006845/0610

illustrated embodiment referred uuird, in the the only figure a wet end of a paper machine in View shows.

The headbox assembly consists of a box with floor and ceiling 10 and 12 connected by the usual Seiteniuände 14 on opposite sides and into which the sludge-like mass is passed through upwardly extending inlet / distributor pipes 16.

The headbox is supported by a cover plate 18 sealed so that it can be pressurized internally by conventional and known means

Before the Bodenujand 10 of the fabric on the box and one adjacent breast lip 20 is an apron plate 22, which, luie can be seen, with a variety of adjustable water extraction devices is provided. the The apron plate is located in front of the opening of the stowage device.

The forward end of the headbox uuird by an adjustable channel-forming UJasserrggler 23 completed, the one across the width of the machine expandable and perpendicular to its foremost stowage device limit point is adjustable, like the

Arrow indicates so that a larger or smaller perpendicular Dimension at the outflow of the damming device 24 is adjustable.

The rear end of the channel hold controller is on the spigot 25 pivotable about the stowage device 24, so that the adjustment of the rear end of the stowage device is possible is indicated by arrows b.

The Fourdrinier include a loop-shaped one, the lower one Fourdrinier wire 30 carrying the web and a loop-shaped one upper fourdrinier 32.

The web-guiding Fourdrinier wire 3D is mounted on rollers and runs in such a way that within the headbox area and immediately wor this a single longitudinal screen forming table section is present, in connection with the drainage elements 34 are effective.

Careful drainage is carried out in the area of the molding table causes the fabric or pulp web on this tail the Fourdrinier reaches a certain degree of felting, so that the fibers, at least the longer ones, do not have the tendency to move among each other and that one comparatively stable fiber structure is built up even before leaving the headbox.

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After passing through the stowage device, the two fourdrinier screens at the point in time opposite each other ujo the two fourdrinier in the beginning part of their common path can be made to run around the curve, the v / om descending quadrants c of a dewatering roll 36 is determined.

The Entiuässerungspartian 34 are each with an independent Provided control means in the form of a pressure gauge 37, which through the pipeline 38 with the associated Chamber 34 and is also connected to a pressure control valve 40, which in turn is connected to an air pump 42 for Creation of the desired vacuum in each chamber is connected.

The form of centrifugal force resulting from the curved path then leads to drainage.

The form of centrifugal force pushes the water into one of the headboxes existing opposite direction, which serves to a one-sided distribution of fine components and to counteract additives caused by the unidirectional drainage inside the headbox is caused for the reason that such constituents still cause movement in the otherwise stable fiber structure are capable.

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The water withdrawn from the web on its upper side will be collected in a cloth catcher 48.

The twin linear sieve section sits in a flat arrangement when l / waiving the drainage roller to a suction transfer, e.g. 50, in which the formed web is transferred from the lower web transport roller to the upper roller,

In the case of this suction transfer roller 50, the twin longitudinal screen design is lost their property, since the web-guiding Fourdrinier wire 30 is a single longitudinal sieve to after the circulation around the Carrying rollers to return to the so-called first part.

The upper fourdrinier wire carrying the formed web is around the lower descending quadrant of the suction transfer roller out so that it becomes a backup roll with a li / alzenspalte leads, which denotes the relationship to the upper flat side of a suction pickup box 52 to the one Wet web saturation or permeation fabric 54 is placed is.

The formed web is transferred from the upper fourdrinier wire to the saturation or through-drying fabric 54, whereupon it goes there to the saturator or through-dryer, as the case may be.

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At the suction removal box 52, the upper fourdrinier is set Run as a single length sieve to get its supporting salts back its starting point in comparison with the lower one Fourdrinier away.

The word part consists of the headbox construction in that it enables a high throughput of material, uiobei the precisely outlined drain opening and its adjustability a function of the amount of substance and the machine speed represent.

909845/0 «! $

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Claims (2)

Claims J paper machine, marked by' a headbox, a Fourdrinier assembly with a loop-shaped first lower fourdrinier and a loop-shaped second upper one Linear sieve, a first located below the headbox Drainage means, the first fourdrinier through the Headbox and over the first drainage agent running single sieve part for the first withdrawal of water from the initially formed web of material, - 2 Telephone: Telegraph: Office hours: Bank accounts: Lindau (083 82) 6917 054374 by appointment Bayer. Vereinsbank Lindau (B) Nr.1208578 (BLZ 735 20074) Hypo-Bank Lindau (B) No. 6670-2Ϋ8 920 (BLZ 735 206 42) Volksbank Lindau (B) No. 51720 000 (BLZ 735 90120) Postal checking account: Munich 295 25-809 a dewatering roller outside the headbox, uiobei the second Fourdrinier in comparison with the first fourdrinier through a double longitudinal compartment in the bar area of the descending quadrant of the dewatering roller, around which the two fourdrinier wires are used for dehydration at times from the web of material being formed by centrifugal force in a direction opposite to the direction of the first dehydration Direction guided u / earth, a Saugüberleitungsujalze, which serves as the end point of the double wire screen part serves and the separation of the first and at times Fourdrinier wire into separate individual longitudinal sieves and the transition the forming web of fabric from the first to the second fourdrinier wire relieved, a vacuum transfer box and cooperating with it loop-shaped fabric to facilitate transition the forming web of fabric wore a second fourdrinier to the fabric, and a saturateur to carry out those carried along by the tissue Length of fabric through this. 2. Paper machine according to claim 1, characterized by an adjustable channel maintenance controller on the fabric overflow box, which is used to change the dimensions of the Stauworrichtung is arranged at the mouth of the substance jet. 3 »Paper machine, characterized by a headbox pressurized internally with a canal control arranged therein to regulate the vertical dimension of the stowage device, a Fourdrinier assembly with a loop-shaped first lower wire and a loop-shaped second upper fourdrinier, a first located below the headbox Drainage means, wherein the first fourdrinier wire is a single wire wire section having passed through the headbox and via the first dewatering means for the first removal of water from the initially forming, within the Headbox runs the laid length of fabric, a dewatering roller outside the headbox, uiobei the second Fourdrinier compared to the first Fourdrinier wire brought over a twin longitudinal wire section in the area of the descending quadrant of the dewatering roller is around which the two fourdrinier wires for the second extraction of water from the forming web by centrifugal force in one be guided in the opposite direction to the direction of the first dehydration, a suction transfer roll, which is the end point of the twin-wire section and to facilitate the separation of the first and second fourdrinier wire into separate individual sections and to transfer the web of fabric that is being formed from the first 80Ö845 / G61B serves to the side of the Fourdrinier,
a suction box, a loop-shaped one around the suction pick-up box Fabric for transferring the web of fabric that is being formed worn second to fabric, and a saturateur to pass through the worn tissues Panel of fabric. Θ0984Β / 0 & 18 - 5 -